158 SPECIES OF THE SYSTEMA. 
hitherto been pointed out in the shells themselves. ‘ Mart. 
Syst. 262, t. 20, f. 184, 185” has been added by Linneus in his 
revised copy. 
Pautilus senrtlituus. 
I can find no additional information respecting this species 
in any writer of the Linnean school, for, although Schréter has 
given some further account of it, his details appear to have 
been gleaned solely from figures, and not to have been derived 
from specimens. As was usually the case when the described 
specimen did not (as in the present instance) form a portion of 
our author's collection, he has not noticed it in his manuscripts. 
The cited engraving of Columna exhibits characters in accord- 
ance with the meagre description, and must consequently be 
regarded as a pictorial definition of the species intended. His 
figures are apparently identical with those in Plancus (Conch. 
Minus Notis, pl. 1, f. 10, O, P}, which latter have been badly 
copied by Martini in one of his earlier plates (Conch. Cab. 1. 
pl. 20, f. 186, 187). “ Judging from these rude drawings, which I 
do not find referred to in the more modern treatises, the sem- 
litwus was a member of the genus Spirolina: my knowledge, 
however, of the Foraminifera is limited. Montagu has de- 
lineated a Nautilus semilituus in the Supplement to his ‘ Tes- 
tacea Britannica (pl. 12, f. 3); his figure, however, does not 
harmonise with that of Plancus in Columna. 
Pautilus obliquus. 
Reference is made in the revised copy of the ‘Systema’ to 
“ Mart. Sys. t. min. 1, f. h. hh.” which engravings are copied 
from the cited ones in Gualtier’s folio. Lamarck quotes these 
figures, and these alone, in illustration of his Orthocera obliqua. 
